Multilayer Ceramic Capacitor and Production Method of the Same
a multi-layer ceramic and production method technology, applied in the direction of fixed capacitors, domestic applications, electrical equipment, etc., can solve the problems of reducing difficult production of fine particles of barium titanate crystals, and affecting the production efficiency of fixed capacitors, so as to reduce the property as ferroelectric materials, reduce the insulating property of grain boundary phases, and improve the properties of multi-layer ceramic capacitors. , the effect of increasing the yield of mass production
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Examples
example 1
Production of Multilayer Ceramic Capacitor
[0084]A multilayer ceramic capacitor was produced as follows. Herein, BT powder and BCT powder with 1.003 A / B site ratio of BT powder and BCT powder were employed. The particle size of the BT and BCT powders employed was 0.2 to 0.4 μm. The BT powder and the BCT powder employed here were respectively coated with Mg, Y and Mn. The coating amounts were MgO=0.022 parts by mass, Y2O3=0.122 parts by mass and MnO=0.023 parts by mass to 100 parts by mass of the BT powder, and MgO=0.065 parts by mass, Y2O3=0.37 parts by mass and MnO=0.069 parts by mass to 100 parts by mass of the BCT powder.
[0085]The glass powder had a composition of SiO2=50, BaO=20, CaO=20 and Li2O=10 (% by mole) and a mean particle size of 0.5 μm, and the addition amount of the glass powder was 1.2 parts by mass to 100 parts by mass of the dielectric powders. In this case, the alumina content in the glass powder employed here was as shown in Table 1. The amount of added barium carb...
example 2
[0106]Multilayer ceramic capacitors (samples No. 8 to 12 in Table 2) were produced in the same manner as the above-mentioned Example 1, except that barium carbonate with the specific surface area shown in Table 2 was used. The results of ABT / ABCT measurement carried out in the same manner as Example I for the obtained multilayer ceramic capacitors were in a range of 0.8 to 1.2. The concentration gradation was 0.05% by atom / nm or higher.
[0107]Next, for these multilayer ceramic capacitors (samples No. 8 to 12 in Table 2), the electrostatic capacity, the relative permittivity, the temperature property of the relative permittivity, the dielectric breakdown voltage, X7R standard, highly accelerated life test (MTTF impedance method), the mean particle size (average value and D90) of the BT type crystal particles and BCT type crystal particles composing the dielectric layers, the evaluation of grain boundary phases (existence of Si—Ba—O compound in triple point grain boundaries 11b and ele...
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Abstract
Description
Claims
Application Information
- IPC
- H01G4/12; C04B35/64
- CPC
- C04B2235/663; Y10T29/435; C04B2235/762; C04B2235/765; C04B2235/784; C04B2235/785; C04B2235/79; C04B2235/80
- Inventors
- FUKUDA, DAISUKE; MATSUBARA, KIYOSHI